Hardening of fluent-operator Helm Chart

[localleon]

Is your feature request related to a problem? Please describe.

Dear all,

we'd like to use this Helm chart in a very restricted environment and therefore would love some inital hardening of the chart!

Describe the solution you'd like

We'd like to have the following defaults in the HelmChart:

• runAsNonRoot set in the securityContext and non-root-uid for the process
• Pod Probes to indicate health of the operator

Additional context

No response

[joshuabaird]

@localleon Hi! We're happy to review PR's if you have time to contribute!